/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #2c3e50;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e8eb 100%);
    min-height: 100vh;
}

/* 导航栏样式 */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    font-size: 2rem;
    font-weight: 800;
    text-decoration: none;
    background: linear-gradient(45deg, #2980b9, #3498db, #2980b9);
    background-size: 200% auto;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: gradient 3s ease infinite;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2.5rem;
}

.nav-menu a {
    color: #34495e;
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: #3498db;
    transition: width 0.3s ease;
}

.nav-menu a:hover::after {
    width: 100%;
}

/* 登录按钮样式 */
.nav-auth {
    display: flex;
    align-items: center;
}

.nav-auth a {
    display: inline-flex;
    align-items: center;
    padding: 0.6rem 1.5rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    color: white;
    background: linear-gradient(135deg, #3498db 0%, #2980b9 100%);
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.2);
    transition: all 0.3s ease;
}

.nav-auth a:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(52, 152, 219, 0.3);
    background: linear-gradient(135deg, #2980b9 0%, #2980b9 100%);
}

/* 主容器样式 */
.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 2rem;
}

h1 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #2c3e50;
}

.usage-count {
    text-align: center;
    color: #7f8c8d;
    font-size: 1.1rem;
    margin-bottom: 3rem;
}

/* 工具容器样式 */
.tool-container {
    background: white;
    padding: 2.5rem;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

/* 上传区域样式 */
.drop-zone {
    border: 3px dashed #e0e0e0;
    border-radius: 15px;
    padding: 3rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.8) 0%, rgba(255, 255, 255, 0.9) 100%);
}

.drop-zone:hover {
    border-color: #3498db;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(52, 152, 219, 0.1);
}

.drop-zone.drag-over {
    border-color: #3498db;
    background: linear-gradient(135deg, rgba(52, 152, 219, 0.1) 0%, rgba(52, 152, 219, 0.2) 100%);
}

.upload-icon {
    color: #3498db;
    margin-bottom: 1.5rem;
}

.upload-tip {
    color: #7f8c8d;
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

/* 转换设置样式 */
.convert-settings {
    margin-top: 2rem;
    padding: 2rem;
    background: #f8f9fa;
    border-radius: 15px;
}

.setting-group {
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 2rem;
}

.setting-group:last-child {
    margin-bottom: 0;
}

.setting-group label {
    min-width: 100px;
    font-weight: 600;
    color: #2c3e50;
}

/* 格式选择器样式 */
.format-control select {
    padding: 0.8rem 1.5rem;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
    background: white;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 150px;
}

.format-control select:focus {
    border-color: #3498db;
    outline: none;
    box-shadow: 0 0 10px rgba(52, 152, 219, 0.1);
}

/* 质量控制样式 */
.quality-control {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex: 1;
}

input[type="range"] {
    flex: 1;
    height: 6px;
    background: #e0e0e0;
    border-radius: 3px;
    -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: #3498db;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 0 10px rgba(52, 152, 219, 0.3);
}

/* 开关样式 */
.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #e0e0e0;
    transition: .4s;
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: #3498db;
}

input:checked + .slider:before {
    transform: translateX(26px);
}

/* 文件列表样式 */
.file-list {
    margin-top: 2rem;
    background: #f8f9fa;
    border-radius: 15px;
    padding: 2rem;
}

.file-list h3 {
    color: #2c3e50;
    font-size: 1.4rem;
    margin-bottom: 1.5rem;
}

.list-header {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr 1.5fr;
    padding: 1rem;
    background: #edf2f7;
    border-radius: 8px;
    font-weight: 600;
    color: #4a5568;
    margin-bottom: 1rem;
}

.file-items {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.file-item {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr 1.5fr;
    align-items: center;
    padding: 1rem;
    background: white;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.file-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

/* 文件信息样式 */
.file-name {
    font-weight: 500;
    color: #2d3748;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-size, .file-format, .converted-format {
    color: #4a5568;
    font-family: monospace;
}

.file-status {
    color: #4a5568;
    font-weight: 500;
}

/* 操作按钮样式 */
.file-action {
    display: flex;
    gap: 0.5rem;
    justify-content: flex-end;
}

.file-action button {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.file-action button svg {
    width: 16px;
    height: 16px;
}

.convert-btn {
    background: linear-gradient(135deg, #4299e1 0%, #3182ce 100%);
    color: white;
}

.convert-btn:hover {
    background: linear-gradient(135deg, #3182ce 0%, #2c5282 100%);
    transform: translateY(-1px);
}

.download-btn {
    background: linear-gradient(135deg, #48bb78 0%, #38a169 100%);
    color: white;
}

.download-btn:hover:not(:disabled) {
    background: linear-gradient(135deg, #38a169 0%, #2f855a 100%);
    transform: translateY(-1px);
}

.download-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.delete-btn {
    background: linear-gradient(135deg, #f56565 0%, #e53e3e 100%);
    color: white;
}

.delete-btn:hover {
    background: linear-gradient(135deg, #e53e3e 0%, #c53030 100%);
    transform: translateY(-1px);
}

/* 批量操作按钮 */
.batch-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid #e2e8f0;
}

.batch-actions button {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    padding: 1rem 2rem;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.batch-actions button svg {
    width: 20px;
    height: 20px;
}

.batch-actions .primary-btn {
    background: linear-gradient(135deg, #4299e1 0%, #3182ce 100%);
    color: white;
    flex: 2;
}

.batch-actions .secondary-btn {
    background: linear-gradient(135deg, #48bb78 0%, #38a169 100%);
    color: white;
    flex: 1;
}

.batch-actions .danger-btn {
    background: linear-gradient(135deg, #f56565 0%, #e53e3e 100%);
    color: white;
    flex: 1;
}

.batch-actions button:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.batch-actions button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* 使用说明样式 */
.notice-box {
    margin-top: 4rem;
    padding: 2.5rem;
    background: linear-gradient(135deg, #fff8e1 0%, #fffdf7 100%);
    border-radius: 20px;
    border-left: 5px solid #f39c12;
    box-shadow: 0 10px 30px rgba(243, 156, 18, 0.1);
}

.notice-box h3 {
    color: #f39c12;
    font-size: 1.6rem;
    margin-bottom: 2rem;
    text-align: center;
    font-weight: 800;
}

.notice-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.notice-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.5rem;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 12px;
    transition: transform 0.3s ease;
}

.notice-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(243, 156, 18, 0.1);
}

.notice-icon {
    font-size: 2rem;
    line-height: 1;
    padding: 1rem;
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.notice-text h4 {
    color: #2c3e50;
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.notice-text p {
    color: #7f8c8d;
    font-size: 0.95rem;
    line-height: 1.5;
}

/* 底部版权样式 */
.footer {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 2rem 0;
    margin-top: 4rem;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    text-align: center;
}

.footer p {
    color: #7f8c8d;
    font-size: 0.95rem;
    margin: 0.5rem 0;
}

.footer a {
    color: #3498db;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer a:hover {
    color: #2980b9;
    text-decoration: underline;
}

/* 辅助类 */
.hidden {
    display: none !important;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-container {
        padding: 1rem;
        flex-wrap: wrap;
    }

    .nav-menu {
        order: 3;
        width: 100%;
        gap: 1rem;
        margin-top: 1rem;
        overflow-x: auto;
        padding-bottom: 0.5rem;
        -webkit-overflow-scrolling: touch;
    }

    .list-header, .file-item {
        grid-template-columns: 2fr 1fr 1fr auto;
        font-size: 0.9rem;
    }

    .file-format, .converted-format {
        display: none;
    }

    .file-action button {
        padding: 0.4rem;
    }

    .file-action button span {
        display: none;
    }

    .batch-actions {
        flex-direction: column;
    }

    .batch-actions button {
        width: 100%;
    }

    .notice-content {
        grid-template-columns: 1fr;
    }

    .setting-group {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .quality-control {
        width: 100%;
    }
}

/* 动画效果 */
@keyframes gradient {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}